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4 (No Model.) 2 Sheets Sheet 1 E. P. WATSON. WATER TUBE BOILER.

INVENTOR ilqgerififfalsom 92 Q ATTORNEYS Patented June 29,1897.

WITNESSES:

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{No Model.) 2 Sheets-Sheet 2. E. P. WATSON. WATER TUBE BOILER.

Patented June 29,1897.

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NITED STATES PATENT WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 585,545, dated June 29,1897. Application filed November 19, 1896. Serial No. 612,756- (Nomodel.)

This invention relates to a novel construction of a watertuhe boiler, aspointed out in the following specification and claims and illustrated inthe accompanying drawings, in

which- Figure 1 shows a vertical central section in the plane 1: i),Fig. 4. Fig. '2 is a horizontal section in the plane w 00, Fig. 1,looking upward. Fig. 3 is a similar section in the plane y 3 Fig. 1,looking downward. Fig. 4 is a vertical central section in the plane w10, Fig. 1. Fig. 5 is a horizontal section in the plane a 2, Fig. 4.

In the drawings the letter A designates an annular water-chamber, whichmay be made of sheet-steel or any other suitable material, and B isanother annular chamber for water and steam. These two chambers areconnected by a diaphragm 0, best made of sheetsteel. In the exampleshown in the drawings this diaphragmis made conical and connected toannular shoulders at 19, formed on the chambers A and B, respectively;but said diaphragm may be made cylindrical and connected to the twochambers in any other suitable manner.

On the outside of the diaphragm C are situated a series of pipes D,which are secured at their upper ends to and open into the water andsteam chamber 13, and at their lower ends they are secured to and openinto the water-chamber A, so that the water can freely circulate throughthese pipes.

Inside of the diaphragm O are situated a series of pipes F, secured attheir upper ends to and opening into the water and steam chamber B,while their lower ends are secured to and open into the water-chamber A,so that the water can freely circulate through these pipes.

G is the fire-grate, which is situated in the annular space of thewater-chamber A, and above this fire-grate is placed a baffle-plate H,which may be secured in position by any suitable means, such as aseriesof rods h, suspended from the bottom of the steam and water chamber 13and at any desired distance above the fire-grate G.

I is the smoke-stack, the diameter of which corresponds to the centraltubular passage 2' of the steam and water chamber B and which intheexample illustrated in the drawings is secured directly to the top ofthe chamber B.

The heated products of combustion which rise from the fire-grate strikethe bathe-plate II and are caused to circulate between the pipes F, andin order to facilitate this circulation said pipes F may be arranged ingroups of four, (more or less,) as shown in Figs. 2 and 5. The water inthe pipes F is thus heated and caused to rise up, while the pipes D areprotected against the directinfluence of the heated products ofcombustion by the diaphragm C, so that the comparatively cool water inthese pipes will descend and a rapid natural circulation of the waterwill be of fected.

The water will be fed into the boiler through a pipe J, which may beconnected to the chamber A, and the steam may be drawn off from theboiler through a pipe K, extending from the top of the chamber B.

In order to get access to the fire-grate G, the diaphragm O is providedwith a door 0 and the pipes D D F F are shortened, (see Fig.

4,) the pipes D being connected at their lower ends to horizontal pipesD which communicate with the pipes D D ,while the pipes F F areconnected at their lower ends to horizontal pipes F F, which communicatewith the pipes F F (See Figs. 1 and 4.)

Instead of placing the fire-grate into the annular space of thechamberAit may be placed into a cylindrical jacket secured to the bottomof said annular chamber, as indicated in dotted lines in Fig. 4, and inthat case no the doorneed be provided in the diaphragmO and the bottomends of all the pipes D and F will be secured in the top of the chamberA.

What I claim as new, and desire to secure by Letters Patent, is

1. In a water-tube boiler, the combination of two annular chambers A B,an outer series of pipes D communicating with said chambers near theirouter circumferences, an inner series of pipes F communicating with saidchambers near their central portions, an annular diaphragm C fastened tothe annular chambers at some distance from their outer circumferences toform a solid shield between the outer series of pipesand the innerseries of pipes and situated at some distance from each series of pipes,a fire-place situated practically beneath the center of the diaphragm O,and a smoke-flue extending through the center of the annular steam andWater chamber B, substantially as described.

2. In a water-tube boiler the combination of two annular chambers A B, apractically unbroken diaphragm O fastened to the annular chambers atsome distance from their outer circumferences, a series of pipes Dconnecting the chambers A B and situated on the outside of the diaphragmO, a series of pipes F situated inside of said diaphragm and alsoconnecting the chambers A B, a fire-grate G situated in the annularspace of the chamber A, the baffle-plate II and a smoke-stack extendingthrough the center of the chamber B substantially as described.

3. In a Water-tube boiler the combination of the annular chambers A B, apractically unbroken diaphragm 0 connected to the annular chambers atsome distance from their outercircumferences, a series of pipes Dconnectin g the chambers A B and situated on the outside of thediaphragm O, a series of pipes F situated inside of said diaphragm andalso connecting the chambers A B, a fire-grate G situated in the annularspace of the chamber A, a fire-door O in the diaphragm O, pipes D D F Ffor giving access to the fire-grate and a smoke-flue extending throughthe center of the chamber B substantially as described.

EGBERT P. \VATSONQ WVitnesses:

WM. 0. HAUFF, E. F. KASTENHUBER.

